Improvement in tension-pulleys



lliure STATES artnr Orifice.

1A. P. NIMES, OF BUFFALO, NE \V YORK.

IMPROVEMENT IN TENs|oN'-Pu| EYs.

Specification forming part of Letters Patent No. 47,323, dated Aprill'l, 1865.

" 0 all whom it 11mg/ conce/w,.-

Be it known that l, A. B. NIMES, ot' the city ot' Bnttalo, county ofErie, and State ot' New York, have invented certain new and nesfulImprove-ments in Tension-Pulleys for Tightening Machinervelts, and I dohereby declare that the following is a full, clear, and exactdescription ot' the construction and operation thereof, reference beinghad to the accompanying drawings, making a part ot' this specification,in which- Figure l is a side elevalionof my improvenient. Fig. Il is afront elevation, partially in section, of same. t

The nature of this invention consists, first, in the construction of arectangular sliding frame of cast-iron for the support ofthetension-pulleys, so that a frame ot' the greatest strength and rigidityis produced, having in itself sufficient' weight to give the requiredtension to the belt; second, in the construe* tion of the journal-boxesin two partsan outer and inner part-the inner box being a sphericalsleeve and the outer box a spherical socket, into which the inner box isinserted, by which the journals of the shafts running therein areprevented from binding or heating, when from any cause saidjournal-boxes have been or may be moved from their normal position;third, in supporting the tensionpulleys in a weighted sliding or hingedframe by means of journal-boxes so constructed and arranged as to becapable of ready adjustment to keep the axis of the tension-pulleys inexact line with that of the driver and prevent the belt from running offor working sidewise on the pulleys, without such adjustment causing thejournals of the pulleys to bind or run hard in t-he boxes.

Letters of like name and kind refer to like parts in each of the igures.

A represents the tension-pulley frame, rect-4 angular in form, the wholeframe being made of cast-iron and of sufcient weight to give therequired tension to the belt, by which the greatest strength andrigidity are given thereto. The bottom cross-piece is extended, as

shown at A', forming a table. Longitudinal tongues A2 are formed on thesides of the frame, which tit in to grooves in the guide-posts betweenwhich the frame moves.

B represents the tension-pulleys, two in number, each bearing on onestrctrh of the belt they are required to tighten.

C C represent the journal-boxes, made in two partsan outer'and innerpartthe inner box, C', being a spherical sleeve within which the journalot' thetension-pulley runs, (meaning by the term spherical sleeve asphere or ball having a cylindrical hole bored through its center forthe reception of` the straight journal of the shaft running therein,)and the outer` box, C, being a spherical socket within which thespherical sleeve: C g is contained. The outer box or socket, C, isdivided into two halves, to permit of the insertion of the sphericalsleeve therein. n

The outer box, C, is supported in the frame l A in a manner to providefor its vertical adl justinent, by being placed in the rectangularspaces formed by the projected jaws B and removable cap B2, bolted tothejaws, the cap allowing of the insertion of the boxes and holding themin place when in. The vertical sides of the boxes are grooved and correjsponding tongues formed on .the frame and cap, as shown at b3, whichguide the boxes in their vertical adjustment. Setscrews b4, work`` ingthrough the jaws B', above and below the boxes, furnish the means forthe vertical adjustment of the boxes.

I) represents oil-cups which communicate with the journals through theholes d', bored through the outer and inner box, the hole throughboththe outer and inner box being countersunk to keep open the communicationwith the oil-cup during any variation of the position of the boxes intheir adjustment. A piece of gaspipe or tubing may be inserted into theinner box, projecting through an enlarged hole tothe oil-cup, which willalso prevent the inner box turning or rolling too much in the outer box.

The advantages of this invention may ,be`

briefly set forth, as follows:

First. By making the tens1on-pulley `frame in one solid casting it maybe given a strength l and rigidity it is impossible to obtain by anyframing of wood, or wood and iron; alsoa certain amount of weight beingrequired in any case, it involves no additional expense to put suchweight into the frame itself, while the important element of strengthand rigidityis obtained thereby.

formed on the cap B2, x

Second. From the construction of thejournal-box with the sphericalsleeve and socket, any change in the position of the journalboxes,supporting the same shaft, with refervence to each other, does notaffect the freedom of the journals, since the spherical sleeve willsimply rock or roll in the socket and accommodate itself to the changedposition of the shaft-journal. This construction also produces ajournal-box peculiarly applicable to lines of shafting in machine-shops,elevators, Src., as it prevents the journals running therein frombinding and heating, when, from any cause-such as settling ofbuilding,85e.--

they may get out o f linej thus saving` a great loss by friction in thepower transmitted, and greatly increasing their durability. In itsadjustable feature it also furnishes aready means of bringing them backwhen, from any cause, they may be out of line.

Third. This feature is especially valuable in its 'connection with thetension-pulleys and frame, which are frequently used in places (fortightening elevator driving-belts, for example) in which the distancefrom the driving-pulley to the tension-pulleys is so great 2. Thecombination of the spherical sleeve C', within which the straightjournal of the shaft runs, with the spherical socket C, for the purposesand substantially as set forth.

3. Supporting the tension-pulleys B in the frame A by meansofjournal-boxes C C', made capable otl adjustment, to bring thetensionpulley shafts in line with that of the driver, Without suchadjustment causing thenr to bind the journals running therein.

' A. B. NIMES.

Witnesses:

Guo. W. WALL/ion, B. H. MUEHLE.

